links_group_html error handling

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs@19753 a0171fae-0946-0410-966d-b1775066cd26
Released 3.0.15, new version 3.0.16

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs@19754 a0171fae-0946-0410-966d-b1775066cd26